Data on the rheological behavior of samples of materials of the porcelain group at pure shear were obtained, complementing the results of dilatometric studies of shrinkage. The concept of the macromechanism of deformation along the critical regions is proposed, which explains the shear deformation in the low-temperature region, which is carried out due to the sliding of grains along the boundaries of their contacts (СЗ). The presence of a constant (with respect to the heating temperature and significant up to 1200 ° C) structural-rheological component was found, which is responsible for the dilatant behavior caused by the SZ. In the temperature regions of intense crystallization of mullite, the maximum rate of shrinkage corresponds to the maximum rate of increase in viscosity. Il. 12, bibliography: 14 titles.
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